package top.shiyiri.reflection3;

import org.junit.Test;
import top.shiyiri.reflection2.Person;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * @author Aunean
 * @date 2022/1/12
 */
/*
获取运行时类的方法结构
 */
public class MethodTest {

    @Test
    public void test1() {
        Class<Person> clazz = Person.class;

        //getMethods()：获取当前运行时类及其父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for (Method method: methods) {
            System.out.println(method);
        }

        System.out.println("**********************************");

        //getDeclaredMethods()：获取当前运行时类中声明的所有方法（不包含父类中的方法）
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method method: declaredMethods) {
            System.out.println(method);
        }
    }

    /*
    @Xxx
    权限修饰符 返回值类型 方法名(参数名1, 参数名2) throws xxxException{}
     */
    @Test
    public void test2() {
        Class<Person> clazz = Person.class;
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method method: declaredMethods) {
            //1.获取方法声明的注解
            Annotation[] annotations = method.getAnnotations();
            for (Annotation annotation: annotations) {
                System.out.println(annotation);
            }

            //2.权限修饰符
            System.out.print(Modifier.toString(method.getModifiers())+"\t");

            //3.返回值类型
            System.out.print(method.getReturnType().getName() + "\t");

            //4.方法名
            System.out.print(method.getName());
            System.out.print("(");
            //5.形参列表
            Class<?>[] parameterTypes = method.getParameterTypes();
            if (!(parameterTypes == null && parameterTypes.length == 0)) {
                for (int i = 0; i < parameterTypes.length; i++) {
                    if (i == parameterTypes.length - 1) {
                        System.out.print(parameterTypes[i].getName() + " args_" + i);
                        break;
                    }
                    System.out.print(parameterTypes[i].getName() + " args_" + i + ",");
                }
            }
            System.out.print(")");

            //6.抛出的异常
            Class<?>[] exceptionTypes = method.getExceptionTypes();
            if (exceptionTypes != null && exceptionTypes.length > 0) {
                System.out.print("throws ");
                for (int i = 0; i < exceptionTypes.length; i++) {
                    if (i == exceptionTypes.length -1) {
                        System.out.print(exceptionTypes[i].getName());
                        break;
                    }
                    System.out.print(exceptionTypes[i].getName() + ", ");
                }
            }

            System.out.println();
        }
    }
}
